Radio tuner



FIG. 1 is a front, top, right perspective view thereof;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a back elevation view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a right elevation view thereof; and,

FIG. 7 is a left elevation view thereof.

The broken lines represent the portions of the design that form no partof the claim.

The ornamental design for a radio tuner, as shown and described.